A catalogue of the American Hesperiidae : indicating the classification and nomenclature adopted in the British Museum (Natural History). Pt. I, Introduction and Group A, Pyrrhopyginae / British Museum (Natural History). Department of Entomology. Evans, William Harry, 1876- text London : Printed by order of the Trustees of the British Museum, 1951. eng x, 92 p,, 9 p of plates : 24 cm. British Museum (Natural History). Department of Entomology. -- Catalogues and collections. Hesperiidae -- United States. Butterflies -- Lepidoptera -- Hesperiidae -- Pyrrhopyginae. Butterflies -- United States.